High pressure Diels-Alder reactions of furan and dimethylmaleate, and thiophene and maleimide resulted in two cantharidin analogues, 3 and 6 possessing PP1 selectivity (>40- and >30-fold selectivity) over PP2A. Both compounds exhibited moderate PP1 activity, 3 IC(50) 50 microM and 6 IC(50) 12.5 microM. Interestingly, the corresponding mono-ester derivatives of 3 showed no such selectivity.
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| http://dx.doi.org/10.1016/s0960-894x(01)00777-6 | DOI Listing |
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